CVE-2026-92598

Medium

Description

Nodemailer before 9.1.0 fails to apply UTS-46 normalization when encoding international domain names, causing the domain resolver to compute a different Punycode A-label than standards-compliant parsers. Attackers can craft recipient addresses with invisible characters or compatibility mappings that pass domain allow-list checks but are delivered to attacker-controlled domains via SMTP.

SeverityMedium

CVSS6.5

Exploit probability—

ProductNodemailer

PublishedSep 16, 2026

First seenSep 16, 2026

Weakness typeCWE-436CWE-436

How to fix

Update

nodemailer9.1.0 or later

Patches

Vendor advisories

github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp

Affected products

Product	Affected versions	Fixed in
nodemailernpm	v < 9.1.0	9.1.0

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